<template>
    <div>
        <router-link v-show="showAbs" tag="div" to="/" class="header-abs" >
            <div class="iconfont back-icon">&#xe624;</div>
        </router-link>
        <div class="header-fixed" v-show="!showAbs" :style="opacityStyle">
            <router-link tag="div" to="/">
                <div class="iconfont header-fixed-back">&#xe624;</div>
            </router-link>
            景点详情
        </div>
    </div>
</template>

<script>
    export default {
        name: 'DetailHeader',
        data() {
            return {
                showAbs: true,
                opacityStyle: {
                    opacity: 0
                }
            }
        },
        methods: {
            handleScroll(){
                const top = document.documentElement.scrollTop
                if(top > 60){
                    if(top <140){
                        let opacity = top/140    
                        opacity = opacity > 1 ? 1 : opacity
                        this.opacityStyle = {
                            opacity
                        }
                        window.console.log('111')
                    }
                    this.showAbs = false
                }else{
                    this.showAbs = true
                }
            }
        },
        activated() {
            window.addEventListener('scroll', this.handleScroll)
        },
        deactivated() {
            window.removeEventListener('scroll', this.handleScroll)
        }
    }
</script>

<style scoped lang='stylus'>
    @import '../../../assets/styles/varibles.styl'
    .header-abs
        position absolute
        left .2rem
        top .2rem
        width .8rem
        height .8rem
        line-height .8rem
        text-align center
        border-radius .4rem
        background rgba(0,0,0,.8)
        .back-icon
            color #ffffff
            font-size .4rem
    .header-fixed
        z-index 2
        position fixed
        top 0
        left 0
        right 0
        height $headerHeight
        line-height $headerHeight
        text-align center
        color #fff
        overflow hidden
        background $bgColor
        font-size .32rem
        .header-fixed-back
            color #fff
            position absolute
            text-align center
            font-size .4rem
            width .64rem
            top 0
</style>